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Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]    
Carrying value of the loans pledged $ 70,000 $ 172,743
Short term advances outstanding $ 70,000 $ 172,743
Weighted average interest rate on short term advances 2.63% 1.56%
Collateral used to secure confirming letters of credit $ 1,500  
Weighted Rate    
Federal Home Loan Bank, Advances, Maturities Summary, One to Five Years $ 0 $ 0
Federal Home Loan Bank Advances, Maturities Summary, Average Interest Rate of Amounts Due in One to Five Years of Balance Sheet Date 0.00% 0.00%
Federal Home Loan Bank, Advances, Maturities Summary, Average Interst Rate of Amounts 2.63% 1.56%
Des Moines    
Federal Home Loan Bank, Advances, Branch of FHLB [Line Items]    
Carrying value of the loans pledged $ 1,166,900 $ 1,144,400
Availability under the secured line of credit 602,000  
Investment in capital stock $ 9,200